add helper functions for vfat images

Signed-off-by: Michael Olbrich <m.olbrich@pengutronix.de>

1 files changed, 59 insertions, 0 deletions

diff --git a/scripts/lib/ptxd_make_image_vfat.sh b/scripts/lib/ptxd_make_image_vfat.sh
new file mode 100644
index 000000000..0a207aaea
--- /dev/null
+++ b/scripts/lib/ptxd_make_image_vfat.sh
@@ -0,0 +1,59 @@
+#!/bin/bash
+#
+# Copyright (C) 2011 by Michael Olbrich <m.olbrich@pengutronix.de>
+#
+# See CREDITS for details about who has contributed to this project.
+#
+# For further information about the PTXdist project and license conditions
+# see the README file.
+#
+
+ptxd_make_image_vfat_add() {
+    local image="${1}"
+    local src="${2}"
+    local dst="${3}"
+
+    if [ ! -e "${src}" ]; then
+	ptxd_bailout "source file '$(ptxd_print_path "${src}")' for '$(ptxd_print_path "${image}") missing!"
+    fi
+    MTOOLS_SKIP_CHECK=1 mcopy -i "${image}" "${src}" "::${dst}"
+}
+export -f ptxd_make_image_vfat_add
+
+#
+# create a vfat image and fill it.
+#
+# in:
+# - $image_vfat_file	the image file name
+# - $image_vfat_size	the image file size in bytes. Guessed if undefined.
+# - $image_vfat_map	file with $src:$dst mappings for the image content
+#
+ptxd_make_image_vfat() {
+    local image="${image_vfat_file}.tmp"
+    local src dst
+
+    if [ -z "${image_vfat_size}" ]; then
+	local size=0
+	while IFS=: read src dst; do
+	    local tmp="$(du -b "${src}")"
+	    size=$[${size}+${tmp%%	*}]
+	done < "${image_vfat_map}"
+	# + 10%
+	size=$[${size}+${size}/10]
+	# round up to 16k
+	size=$[(${size}/16384+1)*16384]
+	image_vfat_size="${size}"
+    fi
+    rm -f "${image_vfat_file}" "${image}" &&
+    # just seek to prepare the size for mkfs.vfat
+    dd if=/dev/zero of="${image}" seek=${image_vfat_size} count=0 bs=1 2>/dev/null &&
+    mkfs.vfat "${image}" >/dev/null &&
+
+    while IFS=: read src dst; do
+	ptxd_make_image_vfat_add "${image}" "${src}" "${dst}" || return
+    done < "${image_vfat_map}" &&
+
+    mv "${image}" "${image_vfat_file}"
+}
+export -f ptxd_make_image_vfat
+